How2CentOS posted a guide about installing Webmin on CentOS 5.5
This brief yet effective tutorial will instruct you on how to install CentOS 5.5 with Webmin, a web-based interface for system administration for Linux The assumption for this CentOS 5.5 Webmin tutorial is that you are running as root and have a basic understanding of the software requiredInstalling Webmin on CentOS 5.5 Tutorial